1 /* Copyright (C) 2001-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <dirent.h>
19 #include <stddef.h>
20 #include <hurd.h>
21 #include <hurd/fs.h>
22 #include <hurd/fd.h>
23 #include "dirstream.h"
24
25 /* Read a directory entry from DIRP. */
26 struct dirent64 *
__readdir64(DIR * dirp)27 __readdir64 (DIR *dirp)
28 {
29 struct dirent64 *dp;
30
31 if (dirp == NULL)
32 {
33 errno = EINVAL;
34 return NULL;
35 }
36
37 __libc_lock_lock (dirp->__lock);
38
39 do
40 {
41 if (dirp->__ptr - dirp->__data >= dirp->__size)
42 {
43 /* We've emptied out our buffer. Refill it. */
44
45 char *data = dirp->__data;
46 int nentries;
47 error_t err;
48
49 if (err = HURD_FD_PORT_USE (dirp->__fd,
50 __dir_readdir (port,
51 &data, &dirp->__size,
52 dirp->__entry_ptr,
53 -1, 0, &nentries)))
54 {
55 __hurd_fail (err);
56 dp = NULL;
57 break;
58 }
59
60 /* DATA now corresponds to entry index DIRP->__entry_ptr. */
61 dirp->__entry_data = dirp->__entry_ptr;
62
63 if (data != dirp->__data)
64 {
65 /* The data was passed out of line, so our old buffer is no
66 longer useful. Deallocate the old buffer and reset our
67 information for the new buffer. */
68 __vm_deallocate (__mach_task_self (),
69 (vm_address_t) dirp->__data,
70 dirp->__allocation);
71 dirp->__data = data;
72 dirp->__allocation = round_page (dirp->__size);
73 }
74
75 /* Reset the pointer into the buffer. */
76 dirp->__ptr = dirp->__data;
77
78 if (nentries == 0)
79 {
80 /* End of file. */
81 dp = NULL;
82 break;
83 }
84
85 /* We trust the filesystem to return correct data and so we
86 ignore NENTRIES. */
87 }
88
89 dp = (struct dirent64 *) dirp->__ptr;
90 dirp->__ptr += dp->d_reclen;
91 ++dirp->__entry_ptr;
92
93 /* Loop to ignore deleted files. */
94 } while (dp->d_fileno == 0);
95
96 __libc_lock_unlock (dirp->__lock);
97
98 return dp;
99 }
100
101 libc_hidden_def (__readdir64)
102 weak_alias (__readdir64, readdir64)
103